<?php
//dezend by http://www.yunlu99.com/ QQ:270656184
defined('BASEPATH') || exit('No direct script access allowed');
class CI_DB_pdo_cubrid_forge extends CI_DB_pdo_forge
{
	/**
	 * CREATE DATABASE statement
	 *
	 * @var	string
	 */
	protected $_create_database = false;
	/**
	 * DROP DATABASE statement
	 *
	 * @var	string
	 */
	protected $_drop_database = false;
	/**
	 * CREATE TABLE keys flag
	 *
	 * Whether table keys are created from within the
	 * CREATE TABLE statement.
	 *
	 * @var	bool
	 */
	protected $_create_table_keys = true;
	/**
	 * DROP TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_drop_table_if = 'DROP TABLE IF EXISTS';
	/**
	 * UNSIGNED support
	 *
	 * @var	array
	 */
	protected $_unsigned = array('SHORT' => 'INTEGER', 'SMALLINT' => 'INTEGER', 'INT' => 'BIGINT', 'INTEGER' => 'BIGINT', 'BIGINT' => 'NUMERIC', 'FLOAT' => 'DOUBLE', 'REAL' => 'DOUBLE');

	protected function _alter_table($alter_type, $table, $field)
	{
		if (in_array($alter_type, array('DROP', 'ADD'), true)) {
			return parent::_alter_table($alter_type, $table, $field);
		}

		$sql = 'ALTER TABLE ' . $this->db->escape_identifiers($table);
		$sqls = array();
		$i = 0;

		for ($c = count($field); $i < $c; $i++) {
			if ($field[$i]['_literal'] !== false) {
				$sqls[] = $sql . ' CHANGE ' . $field[$i]['_literal'];
			}
			else {
				$alter_type = (empty($field[$i]['new_name']) ? ' MODIFY ' : ' CHANGE ');
				$sqls[] = $sql . $alter_type . $this->_process_column($field[$i]);
			}
		}

		return $sqls;
	}

	protected function _process_column($field)
	{
		$extra_clause = (isset($field['after']) ? ' AFTER ' . $this->db->escape_identifiers($field['after']) : '');
		if (empty($extra_clause) && isset($field['first']) && ($field['first'] === true)) {
			$extra_clause = ' FIRST';
		}

		return $this->db->escape_identifiers($field['name']) . (empty($field['new_name']) ? '' : ' ' . $this->db->escape_identifiers($field['new_name'])) . ' ' . $field['type'] . $field['length'] . $field['unsigned'] . $field['null'] . $field['default'] . $field['auto_increment'] . $field['unique'] . $extra_clause;
	}

	protected function _attr_type(&$attributes)
	{
		switch (strtoupper($attributes['TYPE'])) {
		case 'TINYINT':
			$attributes['TYPE'] = 'SMALLINT';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'MEDIUMINT':
			$attributes['TYPE'] = 'INTEGER';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'LONGTEXT':
			$attributes['TYPE'] = 'STRING';
			return NULL;
		default:
			return NULL;
		}
	}

	protected function _process_indexes($table)
	{
		$sql = '';
		$i = 0;

		for ($c = count($this->keys); $i < $c; $i++) {
			if (is_array($this->keys[$i])) {
				$i2 = 0;

				for ($c2 = count($this->keys[$i]); $i2 < $c2; $i2++) {
					if (!isset($this->fields[$this->keys[$i][$i2]])) {
						unset($this->keys[$i][$i2]);
						continue;
					}
				}
			}
			else if (!isset($this->fields[$this->keys[$i]])) {
				unset($this->keys[$i]);
				continue;
			}

			is_array($this->keys[$i]) || $this->keys[$i] = array($this->keys[$i]);
			$sql .= ",\n\tKEY " . $this->db->escape_identifiers(implode('_', $this->keys[$i])) . ' (' . implode(', ', $this->db->escape_identifiers($this->keys[$i])) . ')';
		}

		$this->keys = array();
		return $sql;
	}
}

?>
